To draw this, first, you need to be familier with autocad basic commands such as lines, polylines, subtract, intersect, 3D rotate, extrude, presspull, sweep and other basic commands. I upload a video instead of showing step by step diagram.
I hope it will help you understand the method of drawing hex nut & thread. My drawing will not be perfect but homework for you to implement better prototype & related drawings base on this lesson.
Have fun. 
